Magnetic properties and magnetocaloric effects of Tb6Coi.67Si3 have been investigated by magnetization measurement. This compound is of a hexagonal Ce6Ni2Si3-type structure with a saturation magnetization of 187emu/g ...Magnetic properties and magnetocaloric effects of Tb6Coi.67Si3 have been investigated by magnetization measurement. This compound is of a hexagonal Ce6Ni2Si3-type structure with a saturation magnetization of 187emu/g at 5 K and a reversible second-order magnetic transition at Curie temperature TC = 186K. A magnetic entropy change △S = 7J·kg^-1·K^-1 is observed for a magnetic field change from 0 to 5T. A large value of refrigerant capacity （RC） is found to be 330 J/kg for fields ranging from 0 to ST. The large RC, the reversible magnetization around Tc and the easy fabrication make the Tb6Co1.67Si3 compound a suitable candidate for magnetic refrigerants in a corresponding temperature range.展开更多
The magnetic properties and the magnetic entropy change AS have been investigated for Gd6Co1.67Si3 compounds with a second-order phase transition. The saturation moment at 5 K and the Curie temperature TC are 38.1μB ...The magnetic properties and the magnetic entropy change AS have been investigated for Gd6Co1.67Si3 compounds with a second-order phase transition. The saturation moment at 5 K and the Curie temperature TC are 38.1μB and 298 K, respectively. The AS originates from a reversible second-order magnetic transition around TC and its value reaches 5.2 J/kg.K for a magnetic field change from 0 to 5T. The refrigerant capacity （RC） of Gd6Co1.67Si3 are calculated by using the methods given in Refs.[12] and [21], respectively, for a field change of 0 5T and its values are 310 and 440 J/kg, which is larger than those of some magnetocaloric materials with a first-order phase transition.展开更多
基金Project supported by the National Natural Science Foundation of China （Grant Nos 50571112 and 50731007）, the National Basic Research Program of China （Grant No 2006CB601101） and the Basic Research Program of Chinese Academy of Sciences （Grant No KJCX2-YW-W02）.
文摘Magnetic properties and magnetocaloric effects of Tb6Coi.67Si3 have been investigated by magnetization measurement. This compound is of a hexagonal Ce6Ni2Si3-type structure with a saturation magnetization of 187emu/g at 5 K and a reversible second-order magnetic transition at Curie temperature TC = 186K. A magnetic entropy change △S = 7J·kg^-1·K^-1 is observed for a magnetic field change from 0 to 5T. A large value of refrigerant capacity （RC） is found to be 330 J/kg for fields ranging from 0 to ST. The large RC, the reversible magnetization around Tc and the easy fabrication make the Tb6Co1.67Si3 compound a suitable candidate for magnetic refrigerants in a corresponding temperature range.
基金Project supported by the National Natural Science Foundation of China (Grant Nos 50571112 and 50731007)the National Basic Research Program of China (Grant No 2006CB601101)the Basic Research Program of Chinese Academy of Sciences, China (Grant No KJCX2-YW-W02)
文摘The magnetic properties and the magnetic entropy change AS have been investigated for Gd6Co1.67Si3 compounds with a second-order phase transition. The saturation moment at 5 K and the Curie temperature TC are 38.1μB and 298 K, respectively. The AS originates from a reversible second-order magnetic transition around TC and its value reaches 5.2 J/kg.K for a magnetic field change from 0 to 5T. The refrigerant capacity （RC） of Gd6Co1.67Si3 are calculated by using the methods given in Refs.[12] and [21], respectively, for a field change of 0 5T and its values are 310 and 440 J/kg, which is larger than those of some magnetocaloric materials with a first-order phase transition.
